Table 1. Risk classification and latent tuberculosis infection screening frequency.

Risk class	High risk	Medium risk
Screening frequency	At least once a year	Once a year*
Departments	Pulmonology, TB, infection clinic Respiratory, TB ward Emergency department Medical ICU Bronchoscopy suite Sputum induction room Spirometry room Laboratory (TB-related work) Aerosol-producing room (e.g., nebulizer) PPM nurse, counseling nurse	None of whom are considered high-risk

HCWs who serve immunocompromised persons (e.g., in an organ transplantation unit or newborn nursery) may be considered to be high risk.

^*HCWs who are in medium-risk departments can be considered for participation in routine follow-up latent tuberculosis infection screening if resources are sufficient.

TB: tuberculosis; ICU: intensive care unit; PPM: public-private mix; HCWs: healthcare workers.